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Photosynthesis in C4 plants is relatively less limited by atmospheric CO2 levels because:

  1. A
    Four carbon acids are the primary initial CO2 fixation products
  2. B
    The primary fixation of CO2 is mediated via PEP carboxylase
  3. C
    Effective pumping of CO2 into bundle sheath cells
  4. D
    RUBISCO in C4 plants has higher affinity for CO2

Solution & Step-by-step Explanation

C4 plants have a unique photosynthetic pathway that allows them to fix CO2 more efficiently than C3 plants. The primary fixation of CO2 in C4 plants is mediated via PEP carboxylase, which has a higher affinity for CO2 than RUBISCO. This allows C4 plants to thrive in environments with low CO2 levels. So, the correct answer is option B. Notice that while options A and C are related to C4 photosynthesis, they are not the primary reason why C4 plants are less limited by atmospheric CO2 levels. Option D is incorrect because RUBISCO in C4 plants does not have a higher affinity for CO2.

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Photosynthesis in C4 plants is relatively less limited by atmospheric CO2 levels because:
A
Four carbon acids are the primary initial CO2 fixation products
B
The primary fixation of CO2 is mediated via PEP carboxylase
C
Effective pumping of CO2 into bundle sheath cells
D
RUBISCO in C4 plants has higher affinity for CO2

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